Heat sink



FIG. 1 is a perspective view of the top of a heat sink showing my new design;

FIG. 2 is a perspective view of the bottom of the heat sink of FIG. 1;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevational view thereof, the rear view being a mirror image;

FIG. 6 is a right side elevational view thereof, the opposite side being a mirror image;

FIG. 7 is a cross-sectional view thereof taken along line 7--7 of FIG. 3;

FIG. 8 is an enlarged top fragment view of the pin and pin base taken of the circled area of FIG. 3; and,

FIG. 9 is an enlarged elevational fragment view of the pin and pin base taken of the circled area of FIG. 7, the rear and side elevational views being the same. 

The ornamental design for a heat sink, as shown and described. 